Fence calculator

14 posts · 210 pickets36 rails · 27 bags of 80 lb

Fenced length (less gates): 96' 0"
Sections: 12 sections
Posts: 14 posts (4×4)
Rails: 36 × 8' 0"
Pickets: 210 pickets
Post concrete: 16.11 ft³
Bags: 27 × 80 lb, or 43 × 50 lb fast-setting

These sketches are here to help you order material and price the work quickly. They are not engineered or shop drawings — always build from your approved project drawings.

Fence lengthPost spacing (on center)

GatesGate width

Rails per section

Picket widthGap between pickets

Post holes

Hole diameterHole depth

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Waste %

Show the math▾

Sections
(fence length − gates) ÷ post spacing, rounded up
96' 0" ÷ 8' 0" = 12
Posts
sections + 1 + one per gate
12 + 1 + 1 = 14
Rails
sections × 3 rails (one rail board per section)
12 × 3 = 36
Pickets
fenced length ÷ (picket width + gap), rounded up
96' 0" ÷ ( 5-1/2" + 0" ) = 210
Concrete
(π ÷ 4 × hole² − post²) × depth × posts
(π ÷ 4 × 10" ² − 3.5"²) × 2' 6" × 14 = 16.11 ft³ ÷ 0.60 = 27

Where the numbers come from

Post concrete: Hole cylinder less the post · 80 lb bag = 0.60 ft³ · 50 lb fast-setting = 0.375 ft³QUIKRETE 5000 data sheet (0.60 ft³ per 80 lb). The 50 lb figure is QUIKRETE Fast-Setting Concrete Mix No. 1004-50 (spec sheet https://quikrete.com/pdfs/spec_data-fastsettingconcretemix.pdf) — check the bag you buy. Hole size and depth depend on soil, frost depth and fence height; many guides use a hole 3× the post width and ⅓–½ of the above-ground height deep. Posts here are dressed 3½" (4×4) or 5½" (6×6).Source

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